Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * cpcihp_zt5550.c |
| 3 | * |
| 4 | * Intel/Ziatech ZT5550 CompactPCI Host Controller driver |
| 5 | * |
| 6 | * Copyright 2002 SOMA Networks, Inc. |
| 7 | * Copyright 2001 Intel San Luis Obispo |
| 8 | * Copyright 2000,2001 MontaVista Software Inc. |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify it |
| 11 | * under the terms of the GNU General Public License as published by the |
| 12 | * Free Software Foundation; either version 2 of the License, or (at your |
| 13 | * option) any later version. |
| 14 | * |
| 15 | * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
| 16 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY |
| 17 | * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL |
| 18 | * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 19 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 20 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 21 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 22 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 23 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 24 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 25 | * |
| 26 | * You should have received a copy of the GNU General Public License along |
| 27 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 28 | * 675 Mass Ave, Cambridge, MA 02139, USA. |
| 29 | * |
| 30 | * Send feedback to <scottm@somanetworks.com> |
| 31 | */ |
| 32 | |
| 33 | #include <linux/config.h> |
| 34 | #include <linux/module.h> |
| 35 | #include <linux/moduleparam.h> |
| 36 | #include <linux/init.h> |
| 37 | #include <linux/errno.h> |
| 38 | #include <linux/pci.h> |
| 39 | #include "cpci_hotplug.h" |
| 40 | #include "cpcihp_zt5550.h" |
| 41 | |
| 42 | #define DRIVER_VERSION "0.2" |
| 43 | #define DRIVER_AUTHOR "Scott Murray <scottm@somanetworks.com>" |
| 44 | #define DRIVER_DESC "ZT5550 CompactPCI Hot Plug Driver" |
| 45 | |
| 46 | #define MY_NAME "cpcihp_zt5550" |
| 47 | |
| 48 | #define dbg(format, arg...) \ |
| 49 | do { \ |
| 50 | if(debug) \ |
| 51 | printk (KERN_DEBUG "%s: " format "\n", \ |
| 52 | MY_NAME , ## arg); \ |
| 53 | } while(0) |
| 54 | #define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME , ## arg) |
| 55 | #define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME , ## arg) |
| 56 | #define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME , ## arg) |
| 57 | |
| 58 | /* local variables */ |
| 59 | static int debug; |
| 60 | static int poll; |
| 61 | static struct cpci_hp_controller_ops zt5550_hpc_ops; |
| 62 | static struct cpci_hp_controller zt5550_hpc; |
| 63 | |
| 64 | /* Primary cPCI bus bridge device */ |
| 65 | static struct pci_dev *bus0_dev; |
| 66 | static struct pci_bus *bus0; |
| 67 | |
| 68 | /* Host controller device */ |
| 69 | static struct pci_dev *hc_dev; |
| 70 | |
| 71 | /* Host controller register addresses */ |
| 72 | static void __iomem *hc_registers; |
| 73 | static void __iomem *csr_hc_index; |
| 74 | static void __iomem *csr_hc_data; |
| 75 | static void __iomem *csr_int_status; |
| 76 | static void __iomem *csr_int_mask; |
| 77 | |
| 78 | |
| 79 | static int zt5550_hc_config(struct pci_dev *pdev) |
| 80 | { |
| 81 | /* Since we know that no boards exist with two HC chips, treat it as an error */ |
| 82 | if(hc_dev) { |
| 83 | err("too many host controller devices?"); |
| 84 | return -EBUSY; |
| 85 | } |
| 86 | hc_dev = pdev; |
| 87 | dbg("hc_dev = %p", hc_dev); |
| 88 | dbg("pci resource start %lx", pci_resource_start(hc_dev, 1)); |
| 89 | dbg("pci resource len %lx", pci_resource_len(hc_dev, 1)); |
| 90 | |
| 91 | if(!request_mem_region(pci_resource_start(hc_dev, 1), |
| 92 | pci_resource_len(hc_dev, 1), MY_NAME)) { |
| 93 | err("cannot reserve MMIO region"); |
| 94 | return -ENOMEM; |
| 95 | } |
| 96 | |
| 97 | hc_registers = |
| 98 | ioremap(pci_resource_start(hc_dev, 1), pci_resource_len(hc_dev, 1)); |
| 99 | if(!hc_registers) { |
| 100 | err("cannot remap MMIO region %lx @ %lx", |
| 101 | pci_resource_len(hc_dev, 1), pci_resource_start(hc_dev, 1)); |
| 102 | release_mem_region(pci_resource_start(hc_dev, 1), |
| 103 | pci_resource_len(hc_dev, 1)); |
| 104 | return -ENODEV; |
| 105 | } |
| 106 | |
| 107 | csr_hc_index = hc_registers + CSR_HCINDEX; |
| 108 | csr_hc_data = hc_registers + CSR_HCDATA; |
| 109 | csr_int_status = hc_registers + CSR_INTSTAT; |
| 110 | csr_int_mask = hc_registers + CSR_INTMASK; |
| 111 | |
| 112 | /* |
| 113 | * Disable host control, fault and serial interrupts |
| 114 | */ |
| 115 | dbg("disabling host control, fault and serial interrupts"); |
| 116 | writeb((u8) HC_INT_MASK_REG, csr_hc_index); |
| 117 | writeb((u8) ALL_INDEXED_INTS_MASK, csr_hc_data); |
| 118 | dbg("disabled host control, fault and serial interrupts"); |
| 119 | |
| 120 | /* |
| 121 | * Disable timer0, timer1 and ENUM interrupts |
| 122 | */ |
| 123 | dbg("disabling timer0, timer1 and ENUM interrupts"); |
| 124 | writeb((u8) ALL_DIRECT_INTS_MASK, csr_int_mask); |
| 125 | dbg("disabled timer0, timer1 and ENUM interrupts"); |
| 126 | return 0; |
| 127 | } |
| 128 | |
| 129 | static int zt5550_hc_cleanup(void) |
| 130 | { |
| 131 | if(!hc_dev) |
| 132 | return -ENODEV; |
| 133 | |
| 134 | iounmap(hc_registers); |
| 135 | release_mem_region(pci_resource_start(hc_dev, 1), |
| 136 | pci_resource_len(hc_dev, 1)); |
| 137 | return 0; |
| 138 | } |
| 139 | |
| 140 | static int zt5550_hc_query_enum(void) |
| 141 | { |
| 142 | u8 value; |
| 143 | |
| 144 | value = inb_p(ENUM_PORT); |
| 145 | return ((value & ENUM_MASK) == ENUM_MASK); |
| 146 | } |
| 147 | |
| 148 | static int zt5550_hc_check_irq(void *dev_id) |
| 149 | { |
| 150 | int ret; |
| 151 | u8 reg; |
| 152 | |
| 153 | ret = 0; |
| 154 | if(dev_id == zt5550_hpc.dev_id) { |
| 155 | reg = readb(csr_int_status); |
| 156 | if(reg) |
| 157 | ret = 1; |
| 158 | } |
| 159 | return ret; |
| 160 | } |
| 161 | |
| 162 | static int zt5550_hc_enable_irq(void) |
| 163 | { |
| 164 | u8 reg; |
| 165 | |
| 166 | if(hc_dev == NULL) { |
| 167 | return -ENODEV; |
| 168 | } |
| 169 | reg = readb(csr_int_mask); |
| 170 | reg = reg & ~ENUM_INT_MASK; |
| 171 | writeb(reg, csr_int_mask); |
| 172 | return 0; |
| 173 | } |
| 174 | |
| 175 | static int zt5550_hc_disable_irq(void) |
| 176 | { |
| 177 | u8 reg; |
| 178 | |
| 179 | if(hc_dev == NULL) { |
| 180 | return -ENODEV; |
| 181 | } |
| 182 | |
| 183 | reg = readb(csr_int_mask); |
| 184 | reg = reg | ENUM_INT_MASK; |
| 185 | writeb(reg, csr_int_mask); |
| 186 | return 0; |
| 187 | } |
| 188 | |
| 189 | static int zt5550_hc_init_one (struct pci_dev *pdev, const struct pci_device_id *ent) |
| 190 | { |
| 191 | int status; |
| 192 | |
| 193 | status = zt5550_hc_config(pdev); |
| 194 | if(status != 0) { |
| 195 | return status; |
| 196 | } |
| 197 | dbg("returned from zt5550_hc_config"); |
| 198 | |
| 199 | memset(&zt5550_hpc, 0, sizeof (struct cpci_hp_controller)); |
| 200 | zt5550_hpc_ops.query_enum = zt5550_hc_query_enum; |
| 201 | zt5550_hpc.ops = &zt5550_hpc_ops; |
| 202 | if(!poll) { |
| 203 | zt5550_hpc.irq = hc_dev->irq; |
| 204 | zt5550_hpc.irq_flags = SA_SHIRQ; |
| 205 | zt5550_hpc.dev_id = hc_dev; |
| 206 | |
| 207 | zt5550_hpc_ops.enable_irq = zt5550_hc_enable_irq; |
| 208 | zt5550_hpc_ops.disable_irq = zt5550_hc_disable_irq; |
| 209 | zt5550_hpc_ops.check_irq = zt5550_hc_check_irq; |
| 210 | } else { |
| 211 | info("using ENUM# polling mode"); |
| 212 | } |
| 213 | |
| 214 | status = cpci_hp_register_controller(&zt5550_hpc); |
| 215 | if(status != 0) { |
| 216 | err("could not register cPCI hotplug controller"); |
| 217 | goto init_hc_error; |
| 218 | } |
| 219 | dbg("registered controller"); |
| 220 | |
| 221 | /* Look for first device matching cPCI bus's bridge vendor and device IDs */ |
| 222 | if(!(bus0_dev = pci_get_device(PCI_VENDOR_ID_DEC, |
| 223 | PCI_DEVICE_ID_DEC_21154, NULL))) { |
| 224 | status = -ENODEV; |
| 225 | goto init_register_error; |
| 226 | } |
| 227 | bus0 = bus0_dev->subordinate; |
| 228 | pci_dev_put(bus0_dev); |
| 229 | |
| 230 | status = cpci_hp_register_bus(bus0, 0x0a, 0x0f); |
| 231 | if(status != 0) { |
| 232 | err("could not register cPCI hotplug bus"); |
| 233 | goto init_register_error; |
| 234 | } |
| 235 | dbg("registered bus"); |
| 236 | |
| 237 | status = cpci_hp_start(); |
| 238 | if(status != 0) { |
| 239 | err("could not started cPCI hotplug system"); |
| 240 | cpci_hp_unregister_bus(bus0); |
| 241 | goto init_register_error; |
| 242 | } |
| 243 | dbg("started cpci hp system"); |
| 244 | |
| 245 | return 0; |
| 246 | init_register_error: |
| 247 | cpci_hp_unregister_controller(&zt5550_hpc); |
| 248 | init_hc_error: |
| 249 | err("status = %d", status); |
| 250 | zt5550_hc_cleanup(); |
| 251 | return status; |
| 252 | |
| 253 | } |
| 254 | |
| 255 | static void __devexit zt5550_hc_remove_one(struct pci_dev *pdev) |
| 256 | { |
| 257 | cpci_hp_stop(); |
| 258 | cpci_hp_unregister_bus(bus0); |
| 259 | cpci_hp_unregister_controller(&zt5550_hpc); |
| 260 | zt5550_hc_cleanup(); |
| 261 | } |
| 262 | |
| 263 | |
| 264 | static struct pci_device_id zt5550_hc_pci_tbl[] = { |
| 265 | { PCI_VENDOR_ID_ZIATECH, PCI_DEVICE_ID_ZIATECH_5550_HC, PCI_ANY_ID, PCI_ANY_ID, }, |
| 266 | { 0, } |
| 267 | }; |
| 268 | MODULE_DEVICE_TABLE(pci, zt5550_hc_pci_tbl); |
| 269 | |
| 270 | static struct pci_driver zt5550_hc_driver = { |
| 271 | .name = "zt5550_hc", |
| 272 | .id_table = zt5550_hc_pci_tbl, |
| 273 | .probe = zt5550_hc_init_one, |
| 274 | .remove = __devexit_p(zt5550_hc_remove_one), |
| 275 | }; |
| 276 | |
| 277 | static int __init zt5550_init(void) |
| 278 | { |
| 279 | struct resource* r; |
| 280 | |
| 281 | info(DRIVER_DESC " version: " DRIVER_VERSION); |
| 282 | r = request_region(ENUM_PORT, 1, "#ENUM hotswap signal register"); |
| 283 | if(!r) |
| 284 | return -EBUSY; |
| 285 | |
| 286 | return pci_register_driver(&zt5550_hc_driver); |
| 287 | } |
| 288 | |
| 289 | static void __exit |
| 290 | zt5550_exit(void) |
| 291 | { |
| 292 | pci_unregister_driver(&zt5550_hc_driver); |
| 293 | release_region(ENUM_PORT, 1); |
| 294 | } |
| 295 | |
| 296 | module_init(zt5550_init); |
| 297 | module_exit(zt5550_exit); |
| 298 | |
| 299 | MODULE_AUTHOR(DRIVER_AUTHOR); |
| 300 | MODULE_DESCRIPTION(DRIVER_DESC); |
| 301 | MODULE_LICENSE("GPL"); |
| 302 | module_param(debug, bool, 0644); |
| 303 | MODULE_PARM_DESC(debug, "Debugging mode enabled or not"); |
| 304 | module_param(poll, bool, 0644); |
| 305 | MODULE_PARM_DESC(poll, "#ENUM polling mode enabled or not"); |